Mould on window frames and sills: the condensation fix
Quick answer
Mould on window frames and sills is caused by condensation — warm indoor air meeting cold glass and frames, leaving water that feeds mould. Reduce indoor humidity, wipe down condensation, improve ventilation, and treat affected frames and seals.
Why windows attract mould
Glass and frames are among the coldest surfaces in any room, so they're the first place warm, humid indoor air condenses. That pooling water on the sill and around the frame is exactly what mould needs. In Cyprus it's especially common in winter and in sealed modern apartments.
The condensation cause
Keep mould from coming back
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This is textbook condensation mould. The more moisture in your indoor air — from cooking, showering, drying laundry, breathing — the more condenses on cold windows. If you wake to wet windows most mornings, that's your sign.
How to stop it
Wipe down morning condensation before it feeds mould, ventilate the room daily, reduce indoor humidity (a dehumidifier helps), and avoid drying clothes near windows. Trickle vents and running an extractor in wet rooms reduce the moisture load across the whole home — the root of the issue is ventilation.
Treating what's there
Clean and treat mouldy frames, seals and sills. If mould has got into the wall around the reveal, or keeps returning despite better habits, it's worth an mould inspection to check the wall isn't damp. mould treatment clears established growth.
Windows mouldy every winter? book a €75 inspection or call +357 96 738151.
Frequently asked questions
Why do my windows get mould in winter?
How do I stop condensation on my windows?
Is window mould harmful?
Why does mould keep coming back on my window sills?
Keep mould from coming back
A monthly plan from €45, or book a one-off inspection.